A collection of key-value pairs that maps from keys to values. The keys
can be any immutable type, and the values can be any type.

key

A data item that is mapped to a value in a dictionary. Keys are used
to look up values in a dictionary.

key-value pair

One of the pairs of items in a dictionary. Values are looked up in a
dictionary by key.

mapping type

A mapping type is a data type comprised of a collection of keys and
associated values. Python’s only built-in mapping type is the
dictionary. Dictionaries implement the
associative array
abstract data type.